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排序方式: 共有200条查询结果,搜索用时 15 毫秒
51.
Purković Damir Suman Darko Jelaska Igor 《International Journal of Technology and Design Education》2021,31(5):919-937
International Journal of Technology and Design Education - Today’s dynamic change of the pupils’ technological environment certainly affects their preferences towards technology, which... 相似文献
52.
Scenario and gaming techniques have a number of complementary characteristics. In this article, the design and evaluation of a gaming-scenario experiment for the exploration of development planning in an urban network in the Netherlands is presented. Two gaming sessions were held using two long-term scenarios (2030) as varying contexts. The combined gaming-scenario approach made it possible to evaluate the impact of external future developments and trends on the administrative and spatial development. Evaluation results of the gaming experiment indicate that the gaming-scenario approach generated new and critical insights on development planning and the future of the urban network. Through the game, the principal, the game leaders but most of all the stakeholder-participants experienced and realized that the management of development planning in urban networks is a very difficult task and is full of pitfalls. 相似文献
53.
We propose a new parametric model – the generalized excess mortality (GEM) model – for converting excess mortality from clinical to insured population. The GEM model has been formulated as a generalization of the excess death rate (EDR) model in terms of a single adjustment parameter (m) that accounts for a partial elimination of a clinical study’s EDR due to the underwriting selection process. The suggested value of the parameter m depends only on the ratio of the impairment’s prevalence rate in the insured population to that in the clinical population. The model’s development has been implemented in two phases: the design phase and the validation phase. In the design phase, the data from the National Health and Nutrition Examination Survey I pertaining to three broad impairments (diabetes, coronary artery disease, and asthma) have been used. As a result, the following equation for the parameter m has been proposed: mk?=?(Pi,k/Pc,k)n, where Pi,k, Pc,k are the prevalence rates of impairment k under study in the insured and the clinical populations, respectively, and n a single universal parameter with its value best approximated as n?=?0.5 (95% confidence interval 0.5–0.6). In the validation phase, several independent clinical studies of three other impairments (Crohn’s disease, epilepsy, and chronic obstructive pulmonary disease) were used. As it has been demonstrated in the validation phase, for a number of impairments, the GEM model can provide a better fit for observed insured population mortality than either one of the conventional EDR or mortality ratio models. 相似文献
54.
Robert E. Hoskisson Mike Wright Igor Filatotchev Mike W. Peng 《Journal of Management Studies》2013,50(7):1295-1321
This paper revisits and extends our earlier work (in 2005) in the pages of this journal. We argue that there is a need for more fine‐grained understanding of the country context along two dimensions: (1) institutional development and (2) infrastructure and factor market development. Specifically, we propose an enriched typology of emerging economies with a focus on mid‐range emerging economies, which are positioned between traditional emerging economies and newly developed economies. Then we examine new multinationals from these mid‐range emerging economies that have internationalized both regionally and globally. We outline directions for further research based on this typology in terms of (1) government influence, (2) resource orchestration, (3) market entry, and (4) corporate governance regarding the internationalization strategy of these emerging multinationals from mid‐range economies. 相似文献
55.
Igor Halperin 《Quantitative Finance》2019,19(9):1543-1553
The QLBS model is a discrete-time option hedging and pricing model that is based on Dynamic Programming (DP) and Reinforcement Learning (RL). It combines the famous Q-Learning method for RL with the Black–Scholes (–Merton) (BSM) model's idea of reducing the problem of option pricing and hedging to the problem of optimal rebalancing of a dynamic replicating portfolio for the option, which is made of a stock and cash. Here we expand on several NuQLear (Numerical Q-Learning) topics with the QLBS model. First, we investigate the performance of Fitted Q Iteration for an RL (data-driven) solution to the model, and benchmark it versus a DP (model-based) solution, as well as versus the BSM model. Second, we develop an Inverse Reinforcement Learning (IRL) setting for the model, where we only observe prices and actions (re-hedges) taken by a trader, but not rewards. Third, we outline how the QLBS model can be used for pricing portfolios of options, rather than a single option in isolation, thus providing its own, data-driven and model-independent solution to the (in)famous volatility smile problem of the Black–Scholes model. 相似文献
56.
We study market timing and pecking order in a sample of debt and equity issues and share repurchases of Canadian firms from 1998 to 2007. We find that only when firms are not financially constrained is there evidence that firms issue (repurchase) equity when their shares are overvalued (undervalued) and evidence that overvalued issuers earn lower postannouncement long‐run returns. Similarly, we find that only when firms are not overvalued do they prefer debt to equity financing. These findings highlight an interaction between market timing and pecking order effects. 相似文献
57.
Salim Chahine Jonathan D. Arthurs Igor Filatotchev Robert E. Hoskisson 《Journal of Corporate Finance》2012,18(1):179-192
This study examines the extent to which principal–principal agency conflicts within venture capital (VC) syndicates lead to additional principal–agent conflicts in IPO firms in two institutional contexts. Using a matched sample of 274 VC-backed IPOs in the US and the UK, it shows that the diversity of a VC syndicate increases pre-IPO discretionary current accruals, used as a proxy for earnings management, but the impact of such diversity is higher in the US. There is also evidence of higher underpricing and lower aftermarket performance in firms with higher earnings management and VC diversity, and these negative performance effects are also higher in the US. Our findings indicate that local and informal institutions have a significant effect on multiple agency conflicts in IPO firms and performance outcomes. 相似文献
58.
Igor Filatotchev Xiaoxiang Zhang Jenifer Piesse 《Asia Pacific Journal of Management》2011,28(1):69-93
Using a comprehensive sample of listed companies in Hong Kong this paper investigates how family control affects private information
abuses and firm performance in emerging economies. We combine research on stock market microstructure with more recent studies
of multiple agency perspectives and argue that family ownership and control over the board increases the risk of private information
abuse. This, in turn, has a negative impact on stock market performance. Family control is associated with an incentive to
distort information disclosure to minority shareholders and obtain private benefits of control. However, the multiple agency
roles of controlling families may have different governance properties in terms of investors’ perceptions of private information
abuse. These findings contribute to our understanding of the conflicting evidence on the governance role of family control
within a multiple agency perspective. 相似文献
59.
This article analyzes the design of innovation contests when the quality of an innovation depends on the research approach, but the best approach is unknown. Inducing a variety of research approaches generates an option value. We show that suitable contests can induce such variety. The buyer‐optimal contest is a bonus tournament, where suppliers can choose only between a low bid and a high bid. This contest implements the socially optimal variety for a suitable parameter range. Finally, we compare the optimal contest to scoring auctions and fixed‐prize tournaments. 相似文献
60.